Drying device

Abstract

A drying device may include: a body defining a drying space therein; a heater disposed in the drying space to face a surface of the film moving in the drying space, including an inner tube and an outer tube, and configured to radiate electromagnetic waves through the outer tube, wherein a surface temperature of the outer tube is maintained at 200 degrees or less; and a reflector at least partially covering the heater and configured to reflect at least a part of the electromagnetic waves radiated from the outer tube of the heater toward the film moving in the drying space. The heater may be configured to radiate electromagnetic waves in a wavelength band below a predetermined wavelength to the film and is configured to absorb electromagnetic waves in a wavelength band equal to or above the predetermined wavelength.

What is claimed is: 
     
         1 . A drying device configured to dry a film including a solvent, the drying device comprising:
 a body comprising an entrance and an exit, wherein the body defines a drying space therein and the film moves from the entrance toward the exit in the drying space;   a heater disposed in the drying space to face a surface of the film moving in the drying space, comprising an inner tube and an outer tube, and configured to radiate electromagnetic waves through the outer tube, wherein a surface temperature of the outer tube is maintained at 200 degrees or less by a fluid flowing between the inner tube and the outer tube; and   a reflector at least partially covering the heater and configured to reflect at least a part of the electromagnetic waves radiated from the outer tube of the heater toward the film moving in the drying space,   wherein   the heater is configured to radiate electromagnetic waves in a wavelength band below a predetermined wavelength to the film and is configured to absorb electromagnetic waves in a wavelength band equal to or above the predetermined wavelength.   
     
     
         2 . The drying device according to  claim 1 , wherein the reflector comprises a first reflective portion disposed opposite to the film moving in the drying space with the heater interposed therebetween. 
     
     
         3 . The drying device according to  claim 2 , wherein
 the reflector further comprises a metal coating layer on a surface of the first reflective portion that faces the heater, and   a reflectance of the metal coating layer for the electromagnetic waves is higher than a reflectance of the first reflective portion for the electromagnetic waves.   
     
     
         4 . The drying device according to  claim 2 , wherein
 the reflector comprises two side reflective portions defining a passing space in which the electromagnetic waves pass between the heater and the surface of the film moving in the drying space, wherein the two side reflective portions are spaced from each other in a width direction of the film perpendicular to a moving direction of the film, and   the film is positioned between the two side reflective portions in the width direction of the film.   
     
     
         5 . The drying device according to  claim 4 , further comprising a partition configured to allow the electromagnetic waves to pass therethrough and disposed in the passing space,
 wherein the partition partitions the passing space into a heater-side space defined between the heater and the partition and a film-side space defined between the film and the partition.   
     
     
         6 . The drying device according to  claim 1 , wherein a reflectance of the reflector for the electromagnetic waves is equal or more than 0.7. 
     
     
         7 . The drying device according to  claim 6 , wherein the reflectance of the reflector for the electromagnetic waves is equal or more than 0.9. 
     
     
         8 . The drying device according to  claim 1 , wherein the heater is configured to radiate electromagnetic waves in a wavelength band below 4.0 micrometers and is configured to absorb electromagnetic waves in a wavelength band equal to or above 4.0 micrometers. 
     
     
         9 . The drying device according to  claim 8 , wherein 80% or more of the electromagnetic waves radiated by the heater is electromagnetic waves in the wavelength band below 4.0 micrometers. 
     
     
         10 . The drying device according to  claim 8 , wherein
 a radiation intensity of the electromagnetic waves radiated from the heater is maximized at a reference wavelength below 4.0 micrometers, and   a radiation intensity of electromagnetic waves at 4.0 micrometers is less than 10% of a radiation intensity of electromagnetic waves at the reference wavelength.